EC-Council Network Defense Essentials (NDE) Practice Test 2026 – Your All-in-One Guide to Exam Success!

Informational signatures are indicators that reveal malicious or unauthorized activity within a system. If these signals go undetected, an attacker can slip in and plant back doors, gaining persistent administrative access. That means they can control systems, escalate privileges, and move around the network over time, all while evading defenses. The primary risk here is ongoing outsider access and control, not a one-time event like a reboot, nor a specific outcome like data encryption or a general performance hit. Those outcomes require different attack methods; the real concern with undetected signals is the sustained, hidden foothold that lets an attacker operate with administrator-level privileges.